// Copyright 2005, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Authors: wan@google.com (Zhanyong Wan)
//
// Low-level types and utilities for porting Google Test to various
// platforms.  They are subject to change without notice.  DO NOT USE
// THEM IN USER CODE.
//
// This file is fundamental to Google Test.  All other Google Test source
// files are expected to #include this.  Therefore, it cannot #include
// any other Google Test header.

#ifndef GTEST_INCLUDE_GTEST_INTERNAL_GTEST_PORT_H_
#define GTEST_INCLUDE_GTEST_INTERNAL_GTEST_PORT_H_

// The user can define the following macros in the build script to
// control Google Test's behavior.  If the user doesn't define a macro
// in this list, Google Test will define it.
//
//   GTEST_HAS_CLONE          - Define it to 1/0 to indicate that clone(2)
//                              is/isn't available.
//   GTEST_HAS_EXCEPTIONS     - Define it to 1/0 to indicate that exceptions
//                              are enabled.
//   GTEST_HAS_GLOBAL_STRING  - Define it to 1/0 to indicate that ::string
//                              is/isn't available (some systems define
//                              ::string, which is different to std::string).
//   GTEST_HAS_GLOBAL_WSTRING - Define it to 1/0 to indicate that ::string
//                              is/isn't available (some systems define
//                              ::wstring, which is different to std::wstring).
//   GTEST_HAS_POSIX_RE       - Define it to 1/0 to indicate that POSIX regular
//                              expressions are/aren't available.
//   GTEST_HAS_PTHREAD        - Define it to 1/0 to indicate that <pthread.h>
//                              is/isn't available.
//   GTEST_HAS_RTTI           - Define it to 1/0 to indicate that RTTI is/isn't
//                              enabled.
//   GTEST_HAS_STD_WSTRING    - Define it to 1/0 to indicate that
//                              std::wstring does/doesn't work (Google Test can
//                              be used where std::wstring is unavailable).
//   GTEST_HAS_TR1_TUPLE      - Define it to 1/0 to indicate tr1::tuple
//                              is/isn't available.
//   GTEST_HAS_SEH            - Define it to 1/0 to indicate whether the
//                              compiler supports Microsoft's "Structured
//                              Exception Handling".
//   GTEST_HAS_STREAM_REDIRECTION
//                            - Define it to 1/0 to indicate whether the
//                              platform supports I/O stream redirection using
//                              dup() and dup2().
//   GTEST_USE_OWN_TR1_TUPLE  - Define it to 1/0 to indicate whether Google
//                              Test's own tr1 tuple implementation should be
//                              used.  Unused when the user sets
//                              GTEST_HAS_TR1_TUPLE to 0.
//   GTEST_LANG_CXX11         - Define it to 1/0 to indicate that Google Test
//                              is building in C++11/C++98 mode.
//   GTEST_LINKED_AS_SHARED_LIBRARY
//                            - Define to 1 when compiling tests that use
//                              Google Test as a shared library (known as
//                              DLL on Windows).
//   GTEST_CREATE_SHARED_LIBRARY
//                            - Define to 1 when compiling Google Test itself
//                              as a shared library.

// This header defines the following utilities:
//
// Macros indicating the current platform (defined to 1 if compiled on
// the given platform; otherwise undefined):
//   GTEST_OS_AIX      - IBM AIX
//   GTEST_OS_CYGWIN   - Cygwin
//   GTEST_OS_HPUX     - HP-UX
//   GTEST_OS_LINUX    - Linux
//     GTEST_OS_LINUX_ANDROID - Google Android
//   GTEST_OS_MAC      - Mac OS X
//     GTEST_OS_IOS    - iOS
//       GTEST_OS_IOS_SIMULATOR - iOS simulator
//   GTEST_OS_NACL     - Google Native Client (NaCl)
//   GTEST_OS_OPENBSD  - OpenBSD
//   GTEST_OS_QNX      - QNX
//   GTEST_OS_SOLARIS  - Sun Solaris
//   GTEST_OS_SYMBIAN  - Symbian
//   GTEST_OS_WINDOWS  - Windows (Desktop, MinGW, or Mobile)
//     GTEST_OS_WINDOWS_DESKTOP  - Windows Desktop
//     GTEST_OS_WINDOWS_MINGW    - MinGW
//     GTEST_OS_WINDOWS_MOBILE   - Windows Mobile
//   GTEST_OS_ZOS      - z/OS
//
// Among the platforms, Cygwin, Linux, Max OS X, and Windows have the
// most stable support.  Since core members of the Google Test project
// don't have access to other platforms, support for them may be less
// stable.  If you notice any problems on your platform, please notify
// googletestframework@googlegroups.com (patches for fixing them are
// even more welcome!).
//
// Note that it is possible that none of the GTEST_OS_* macros are defined.
//
// Macros indicating available Google Test features (defined to 1 if
// the corresponding feature is supported; otherwise undefined):
//   GTEST_HAS_COMBINE      - the Combine() function (for value-parameterized
//                            tests)
//   GTEST_HAS_DEATH_TEST   - death tests
//   GTEST_HAS_PARAM_TEST   - value-parameterized tests
//   GTEST_HAS_TYPED_TEST   - typed tests
//   GTEST_HAS_TYPED_TEST_P - type-parameterized tests
//   GTEST_USES_POSIX_RE    - enhanced POSIX regex is used. Do not confuse with
//                            GTEST_HAS_POSIX_RE (see above) which users can
//                            define themselves.
//   GTEST_USES_SIMPLE_RE   - our own simple regex is used;
//                            the above two are mutually exclusive.
//   GTEST_CAN_COMPARE_NULL - accepts untyped NULL in EXPECT_EQ().
//
// Macros for basic C++ coding:
//   GTEST_AMBIGUOUS_ELSE_BLOCKER_ - for disabling a gcc warning.
//   GTEST_ATTRIBUTE_UNUSED_  - declares that a class' instances or a
//                              variable don't have to be used.
//   GTEST_DISALLOW_ASSIGN_   - disables operator=.
//   GTEST_DISALLOW_COPY_AND_ASSIGN_ - disables copy ctor and operator=.
//   GTEST_MUST_USE_RESULT_   - declares that a function's result must be used.
//
// Synchronization:
//   Mutex, MutexLock, ThreadLocal, GetThreadCount()
//                  - synchronization primitives.
//   GTEST_IS_THREADSAFE - defined to 1 to indicate that the above
//                         synchronization primitives have real implementations
//                         and Google Test is thread-safe; or 0 otherwise.
//
// Template meta programming:
//   is_pointer     - as in TR1; needed on Symbian and IBM XL C/C++ only.
//   IteratorTraits - partial implementation of std::iterator_traits, which
//                    is not available in libCstd when compiled with Sun C++.
//
// Smart pointers:
//   scoped_ptr     - as in TR2.
//
// Regular expressions:
//   RE             - a simple regular expression class using the POSIX
//                    Extended Regular Expression syntax on UNIX-like
//                    platforms, or a reduced regular exception syntax on
//                    other platforms, including Windows.
//
// Logging:
//   GTEST_LOG_()   - logs messages at the specified severity level.
//   LogToStderr()  - directs all log messages to stderr.
//   FlushInfoLog() - flushes informational log messages.
//
// Stdout and stderr capturing:
//   CaptureStdout()     - starts capturing stdout.
//   GetCapturedStdout() - stops capturing stdout and returns the captured
//                         string.
//   CaptureStderr()     - starts capturing stderr.
//   GetCapturedStderr() - stops capturing stderr and returns the captured
//                         string.
//
// Integer types:
//   TypeWithSize   - maps an integer to a int type.
//   Int32, UInt32, Int64, UInt64, TimeInMillis
//                  - integers of known sizes.
//   BiggestInt     - the biggest signed integer type.
//
// Command-line utilities:
//   GTEST_FLAG()       - references a flag.
//   GTEST_DECLARE_*()  - declares a flag.
//   GTEST_DEFINE_*()   - defines a flag.
//   GetInjectableArgvs() - returns the command line as a vector of strings.
//
// Environment variable utilities:
//   GetEnv()             - gets the value of an environment variable.
//   BoolFromGTestEnv()   - parses a bool environment variable.
//   Int32FromGTestEnv()  - parses an Int32 environment variable.
//   StringFromGTestEnv() - parses a string environment variable.

#include <ctype.h>   // for isspace, etc
#include <stddef.h>  // for ptrdiff_t
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#ifndef _WIN32_WCE
	#include <sys/types.h>
	#include <sys/stat.h>
#endif  // !_WIN32_WCE

#if defined __APPLE__
	#include <AvailabilityMacros.h>
	#include <TargetConditionals.h>
#endif

#include <iostream>  // NOLINT
#include <sstream>  // NOLINT
#include <string>  // NOLINT

#define GTEST_DEV_EMAIL_ "googletestframework@@googlegroups.com"
#define GTEST_FLAG_PREFIX_ "gtest_"
#define GTEST_FLAG_PREFIX_DASH_ "gtest-"
#define GTEST_FLAG_PREFIX_UPPER_ "GTEST_"
#define GTEST_NAME_ "Google Test"
#define GTEST_PROJECT_URL_ "http://code.google.com/p/googletest/"

// Determines the version of gcc that is used to compile this.
#ifdef __GNUC__
// 40302 means version 4.3.2.
# define GTEST_GCC_VER_ \
	(__GNUC__*10000 + __GNUC_MINOR__*100 + __GNUC_PATCHLEVEL__)
#endif  // __GNUC__

// Determines the platform on which Google Test is compiled.
#ifdef __CYGWIN__
	#define GTEST_OS_CYGWIN 1
#elif defined __SYMBIAN32__
	#define GTEST_OS_SYMBIAN 1
#elif defined _WIN32
	#define GTEST_OS_WINDOWS 1
	#ifdef _WIN32_WCE
		#define GTEST_OS_WINDOWS_MOBILE 1
	#elif defined(__MINGW__) || defined(__MINGW32__)
		#define GTEST_OS_WINDOWS_MINGW 1
	#else
		#define GTEST_OS_WINDOWS_DESKTOP 1
	#endif  // _WIN32_WCE
#elif defined __APPLE__
	#define GTEST_OS_MAC 1
	#if TARGET_OS_IPHONE
		#define GTEST_OS_IOS 1
		#if TARGET_IPHONE_SIMULATOR
			#define GTEST_OS_IOS_SIMULATOR 1
		#endif
	#endif
#elif defined __linux__
	#define GTEST_OS_LINUX 1
	#if defined __ANDROID__
		#define GTEST_OS_LINUX_ANDROID 1
	#endif
#elif defined __MVS__
	#define GTEST_OS_ZOS 1
#elif defined(__sun) && defined(__SVR4)
	#define GTEST_OS_SOLARIS 1
#elif defined(_AIX)
	#define GTEST_OS_AIX 1
#elif defined(__hpux)
	#define GTEST_OS_HPUX 1
#elif defined __native_client__
	#define GTEST_OS_NACL 1
#elif defined __OpenBSD__
	#define GTEST_OS_OPENBSD 1
#elif defined __QNX__
	#define GTEST_OS_QNX 1
#endif  // __CYGWIN__

#ifndef GTEST_LANG_CXX11
	// gcc and clang define __GXX_EXPERIMENTAL_CXX0X__ when
	// -std={c,gnu}++{0x,11} is passed.  The C++11 standard specifies a
	// value for __cplusplus, and recent versions of clang, gcc, and
	// probably other compilers set that too in C++11 mode.
	#if __GXX_EXPERIMENTAL_CXX0X__ || __cplusplus >= 201103L
		// Compiling in at least C++11 mode.
		#define GTEST_LANG_CXX11 1
	#else
		#define GTEST_LANG_CXX11 0
	#endif
#endif

// Brings in definitions for functions used in the testing::internal::posix
// namespace (read, write, close, chdir, isatty, stat). We do not currently
// use them on Windows Mobile.
#if !GTEST_OS_WINDOWS
	// This assumes that non-Windows OSes provide unistd.h. For OSes where this
	// is not the case, we need to include headers that provide the functions
	// mentioned above.
	#include <unistd.h>
	#include <strings.h>
#elif !GTEST_OS_WINDOWS_MOBILE
	#include <direct.h>
	#include <io.h>
#endif

#if GTEST_OS_LINUX_ANDROID
	// Used to define __ANDROID_API__ matching the target NDK API level.
	#include <android/api-level.h>  // NOLINT
#endif

// Defines this to true iff Google Test can use POSIX regular expressions.
#ifndef GTEST_HAS_POSIX_RE
	#if GTEST_OS_LINUX_ANDROID
		// On Android, <regex.h> is only available starting with Gingerbread.
		#define GTEST_HAS_POSIX_RE (__ANDROID_API__ >= 9)
	#else
		#define GTEST_HAS_POSIX_RE (!GTEST_OS_WINDOWS)
	#endif
#endif

#if GTEST_HAS_POSIX_RE

	// On some platforms, <regex.h> needs someone to define size_t, and
	// won't compile otherwise.  We can #include it here as we already
	// included <stdlib.h>, which is guaranteed to define size_t through
	// <stddef.h>.
	#include <regex.h>  // NOLINT

	#define GTEST_USES_POSIX_RE 1

#elif GTEST_OS_WINDOWS

	// <regex.h> is not available on Windows.  Use our own simple regex
	// implementation instead.
	#define GTEST_USES_SIMPLE_RE 1

#else

	// <regex.h> may not be available on this platform.  Use our own
	// simple regex implementation instead.
	#define GTEST_USES_SIMPLE_RE 1

#endif  // GTEST_HAS_POSIX_RE

#ifndef GTEST_HAS_EXCEPTIONS
	// The user didn't tell us whether exceptions are enabled, so we need
	// to figure it out.
	#if defined(_MSC_VER) || defined(__BORLANDC__)
		// MSVC's and C++Builder's implementations of the STL use the _HAS_EXCEPTIONS
		// macro to enable exceptions, so we'll do the same.
		// Assumes that exceptions are enabled by default.
		#ifndef _HAS_EXCEPTIONS
			#define _HAS_EXCEPTIONS 1
		#endif  // _HAS_EXCEPTIONS
		#define GTEST_HAS_EXCEPTIONS _HAS_EXCEPTIONS
	#elif defined(__GNUC__) && __EXCEPTIONS
		// gcc defines __EXCEPTIONS to 1 iff exceptions are enabled.
		#define GTEST_HAS_EXCEPTIONS 1
	#elif defined(__SUNPRO_CC)
		// Sun Pro CC supports exceptions.  However, there is no compile-time way of
		// detecting whether they are enabled or not.  Therefore, we assume that
		// they are enabled unless the user tells us otherwise.
		#define GTEST_HAS_EXCEPTIONS 1
	#elif defined(__IBMCPP__) && __EXCEPTIONS
		// xlC defines __EXCEPTIONS to 1 iff exceptions are enabled.
		#define GTEST_HAS_EXCEPTIONS 1
	#elif defined(__HP_aCC)
		// Exception handling is in effect by default in HP aCC compiler. It has to
		// be turned of by +noeh compiler option if desired.
		#define GTEST_HAS_EXCEPTIONS 1
	#else
		// For other compilers, we assume exceptions are disabled to be
		// conservative.
		#define GTEST_HAS_EXCEPTIONS 0
	#endif  // defined(_MSC_VER) || defined(__BORLANDC__)
#endif  // GTEST_HAS_EXCEPTIONS

#if !defined(GTEST_HAS_STD_STRING)
	// Even though we don't use this macro any longer, we keep it in case
	// some clients still depend on it.
	#define GTEST_HAS_STD_STRING 1
#elif !GTEST_HAS_STD_STRING
	// The user told us that ::std::string isn't available.
	# error "Google Test cannot be used where ::std::string isn't available."
#endif  // !defined(GTEST_HAS_STD_STRING)

#ifndef GTEST_HAS_GLOBAL_STRING
	// The user didn't tell us whether ::string is available, so we need
	// to figure it out.

	#define GTEST_HAS_GLOBAL_STRING 0

#endif  // GTEST_HAS_GLOBAL_STRING

#ifndef GTEST_HAS_STD_WSTRING
// The user didn't tell us whether ::std::wstring is available, so we need
// to figure it out.
// TODO(wan@google.com): uses autoconf to detect whether ::std::wstring
//   is available.

// Cygwin 1.7 and below doesn't support ::std::wstring.
// Solaris' libc++ doesn't support it either.  Android has
// no support for it at least as recent as Froyo (2.2).
# define GTEST_HAS_STD_WSTRING \
	(!(GTEST_OS_LINUX_ANDROID || GTEST_OS_CYGWIN || GTEST_OS_SOLARIS))

#endif  // GTEST_HAS_STD_WSTRING

#ifndef GTEST_HAS_GLOBAL_WSTRING
// The user didn't tell us whether ::wstring is available, so we need
// to figure it out.
# define GTEST_HAS_GLOBAL_WSTRING \
	(GTEST_HAS_STD_WSTRING && GTEST_HAS_GLOBAL_STRING)
#endif  // GTEST_HAS_GLOBAL_WSTRING

// Determines whether RTTI is available.
#ifndef GTEST_HAS_RTTI
	// The user didn't tell us whether RTTI is enabled, so we need to
	// figure it out.

	#ifdef _MSC_VER

		#ifdef _CPPRTTI  // MSVC defines this macro iff RTTI is enabled.
			#define GTEST_HAS_RTTI 1
		#else
			#define GTEST_HAS_RTTI 0
		#endif

		// Starting with version 4.3.2, gcc defines __GXX_RTTI iff RTTI is enabled.
	#elif defined(__GNUC__) && (GTEST_GCC_VER_ >= 40302)

		#ifdef __GXX_RTTI
			// When building against STLport with the Android NDK and with
			// -frtti -fno-exceptions, the build fails at link time with undefined
			// references to __cxa_bad_typeid. Note sure if STL or toolchain bug,
			// so disable RTTI when detected.
			#if GTEST_OS_LINUX_ANDROID && defined(_STLPORT_MAJOR) && \
				!defined(__EXCEPTIONS)
				#define GTEST_HAS_RTTI 0
			#else
				#define GTEST_HAS_RTTI 1
			#endif  // GTEST_OS_LINUX_ANDROID && __STLPORT_MAJOR && !__EXCEPTIONS
		#else
			#define GTEST_HAS_RTTI 0
		#endif  // __GXX_RTTI

		// Clang defines __GXX_RTTI starting with version 3.0, but its manual recommends
		// using has_feature instead. has_feature(cxx_rtti) is supported since 2.7, the
		// first version with C++ support.
	#elif defined(__clang__)

		#define GTEST_HAS_RTTI __has_feature(cxx_rtti)

		// Starting with version 9.0 IBM Visual Age defines __RTTI_ALL__ to 1 if
		// both the typeid and dynamic_cast features are present.
	#elif defined(__IBMCPP__) && (__IBMCPP__ >= 900)

		#ifdef __RTTI_ALL__
			#define GTEST_HAS_RTTI 1
		#else
			#define GTEST_HAS_RTTI 0
		#endif

	#else

		// For all other compilers, we assume RTTI is enabled.
		#define GTEST_HAS_RTTI 1

	#endif  // _MSC_VER

#endif  // GTEST_HAS_RTTI

// It's this header's responsibility to #include <typeinfo> when RTTI
// is enabled.
#if GTEST_HAS_RTTI
	#include <typeinfo>
#endif

// Determines whether Google Test can use the pthreads library.
#ifndef GTEST_HAS_PTHREAD
// The user didn't tell us explicitly, so we assume pthreads support is
// available on Linux and Mac.
//
// To disable threading support in Google Test, add -DGTEST_HAS_PTHREAD=0
// to your compiler flags.
# define GTEST_HAS_PTHREAD (GTEST_OS_LINUX || GTEST_OS_MAC || GTEST_OS_HPUX \
                            || GTEST_OS_QNX)
#endif  // GTEST_HAS_PTHREAD

#if GTEST_HAS_PTHREAD
	// gtest-port.h guarantees to #include <pthread.h> when GTEST_HAS_PTHREAD is
	// true.
	#include <pthread.h>  // NOLINT

	// For timespec and nanosleep, used below.
	#include <time.h>  // NOLINT
#endif

// Determines whether Google Test can use tr1/tuple.  You can define
// this macro to 0 to prevent Google Test from using tuple (any
// feature depending on tuple with be disabled in this mode).
#ifndef GTEST_HAS_TR1_TUPLE
	#if GTEST_OS_LINUX_ANDROID && defined(_STLPORT_MAJOR)
		// STLport, provided with the Android NDK, has neither <tr1/tuple> or <tuple>.
		#define GTEST_HAS_TR1_TUPLE 0
	#else
		// The user didn't tell us not to do it, so we assume it's OK.
		#define GTEST_HAS_TR1_TUPLE 1
	#endif
#endif  // GTEST_HAS_TR1_TUPLE

// Determines whether Google Test's own tr1 tuple implementation
// should be used.
#ifndef GTEST_USE_OWN_TR1_TUPLE
// The user didn't tell us, so we need to figure it out.

// We use our own TR1 tuple if we aren't sure the user has an
// implementation of it already.  At this time, libstdc++ 4.0.0+ and
// MSVC 2010 are the only mainstream standard libraries that come
// with a TR1 tuple implementation.  NVIDIA's CUDA NVCC compiler
// pretends to be GCC by defining __GNUC__ and friends, but cannot
// compile GCC's tuple implementation.  MSVC 2008 (9.0) provides TR1
// tuple in a 323 MB Feature Pack download, which we cannot assume the
// user has.  QNX's QCC compiler is a modified GCC but it doesn't
// support TR1 tuple.  libc++ only provides std::tuple, in C++11 mode,
// and it can be used with some compilers that define __GNUC__.
# if (defined(__GNUC__) && !defined(__CUDACC__) && (GTEST_GCC_VER_ >= 40000) \
      && !GTEST_OS_QNX && !defined(_LIBCPP_VERSION)) || _MSC_VER >= 1600
#  define GTEST_ENV_HAS_TR1_TUPLE_ 1
# endif

// C++11 specifies that <tuple> provides std::tuple. Use that if gtest is used
// in C++11 mode and libstdc++ isn't very old (binaries targeting OS X 10.6
// can build with clang but need to use gcc4.2's libstdc++).
#if GTEST_LANG_CXX11 && (!defined(__GLIBCXX__) || __GLIBCXX__ > 20110325)
	#define GTEST_ENV_HAS_STD_TUPLE_ 1
#endif

#if GTEST_ENV_HAS_TR1_TUPLE_ || GTEST_ENV_HAS_STD_TUPLE_
	#define GTEST_USE_OWN_TR1_TUPLE 0
#else
	#define GTEST_USE_OWN_TR1_TUPLE 1
#endif

#endif  // GTEST_USE_OWN_TR1_TUPLE

// To avoid conditional compilation everywhere, we make it
// gtest-port.h's responsibility to #include the header implementing
// tr1/tuple.
#if GTEST_HAS_TR1_TUPLE

# if GTEST_USE_OWN_TR1_TUPLE
#  include "gtest/internal/gtest-tuple.h"
# elif GTEST_ENV_HAS_STD_TUPLE_
#  include <tuple>
// C++11 puts its tuple into the ::std namespace rather than
// ::std::tr1.  gtest expects tuple to live in ::std::tr1, so put it there.
// This causes undefined behavior, but supported compilers react in
// the way we intend.
namespace std
{
	namespace tr1
	{
		using ::std::get;
		using ::std::make_tuple;
		using ::std::tuple;
		using ::std::tuple_element;
		using ::std::tuple_size;
	}
}

# elif GTEST_OS_SYMBIAN

// On Symbian, BOOST_HAS_TR1_TUPLE causes Boost's TR1 tuple library to
// use STLport's tuple implementation, which unfortunately doesn't
// work as the copy of STLport distributed with Symbian is incomplete.
// By making sure BOOST_HAS_TR1_TUPLE is undefined, we force Boost to
// use its own tuple implementation.
#ifdef BOOST_HAS_TR1_TUPLE
	#undef BOOST_HAS_TR1_TUPLE
#endif  // BOOST_HAS_TR1_TUPLE

// This prevents <boost/tr1/detail/config.hpp>, which defines
// BOOST_HAS_TR1_TUPLE, from being #included by Boost's <tuple>.
#  define BOOST_TR1_DETAIL_CONFIG_HPP_INCLUDED
#  include <tuple>

# elif defined(__GNUC__) && (GTEST_GCC_VER_ >= 40000)
// GCC 4.0+ implements tr1/tuple in the <tr1/tuple> header.  This does
// not conform to the TR1 spec, which requires the header to be <tuple>.

#if !GTEST_HAS_RTTI && GTEST_GCC_VER_ < 40302
	// Until version 4.3.2, gcc has a bug that causes <tr1/functional>,
	// which is #included by <tr1/tuple>, to not compile when RTTI is
	// disabled.  _TR1_FUNCTIONAL is the header guard for
	// <tr1/functional>.  Hence the following #define is a hack to prevent
	// <tr1/functional> from being included.
	#define _TR1_FUNCTIONAL 1
	#include <tr1/tuple>
	#undef _TR1_FUNCTIONAL  // Allows the user to #include
	// <tr1/functional> if he chooses to.
#else
	#include <tr1/tuple>  // NOLINT
#endif  // !GTEST_HAS_RTTI && GTEST_GCC_VER_ < 40302

# else
// If the compiler is not GCC 4.0+, we assume the user is using a
// spec-conforming TR1 implementation.
#  include <tuple>  // NOLINT
# endif  // GTEST_USE_OWN_TR1_TUPLE

#endif  // GTEST_HAS_TR1_TUPLE

// Determines whether clone(2) is supported.
// Usually it will only be available on Linux, excluding
// Linux on the Itanium architecture.
// Also see http://linux.die.net/man/2/clone.
#ifndef GTEST_HAS_CLONE
	// The user didn't tell us, so we need to figure it out.

	#if GTEST_OS_LINUX && !defined(__ia64__)
		#if GTEST_OS_LINUX_ANDROID
			// On Android, clone() is only available on ARM starting with Gingerbread.
			#if defined(__arm__) && __ANDROID_API__ >= 9
				#define GTEST_HAS_CLONE 1
			#else
				#define GTEST_HAS_CLONE 0
			#endif
		#else
			#define GTEST_HAS_CLONE 1
		#endif
	#else
		#define GTEST_HAS_CLONE 0
	#endif  // GTEST_OS_LINUX && !defined(__ia64__)

#endif  // GTEST_HAS_CLONE

// Determines whether to support stream redirection. This is used to test
// output correctness and to implement death tests.
#ifndef GTEST_HAS_STREAM_REDIRECTION
	// By default, we assume that stream redirection is supported on all
	// platforms except known mobile ones.
	#if GTEST_OS_WINDOWS_MOBILE || GTEST_OS_SYMBIAN
		#define GTEST_HAS_STREAM_REDIRECTION 0
	#else
		#define GTEST_HAS_STREAM_REDIRECTION 1
	#endif  // !GTEST_OS_WINDOWS_MOBILE && !GTEST_OS_SYMBIAN
#endif  // GTEST_HAS_STREAM_REDIRECTION

// Determines whether to support death tests.
// Google Test does not support death tests for VC 7.1 and earlier as
// abort() in a VC 7.1 application compiled as GUI in debug config
// pops up a dialog window that cannot be suppressed programmatically.
#if (GTEST_OS_LINUX || GTEST_OS_CYGWIN || GTEST_OS_SOLARIS || \
     (GTEST_OS_MAC && !GTEST_OS_IOS) || GTEST_OS_IOS_SIMULATOR || \
     (GTEST_OS_WINDOWS_DESKTOP && _MSC_VER >= 1400) || \
     GTEST_OS_WINDOWS_MINGW || GTEST_OS_AIX || GTEST_OS_HPUX || \
     GTEST_OS_OPENBSD || GTEST_OS_QNX)
# define GTEST_HAS_DEATH_TEST 1
# include <vector>  // NOLINT
#endif

// We don't support MSVC 7.1 with exceptions disabled now.  Therefore
// all the compilers we care about are adequate for supporting
// value-parameterized tests.
#define GTEST_HAS_PARAM_TEST 1

// Determines whether to support type-driven tests.

// Typed tests need <typeinfo> and variadic macros, which GCC, VC++ 8.0,
// Sun Pro CC, IBM Visual Age, and HP aCC support.
#if defined(__GNUC__) || (_MSC_VER >= 1400) || defined(__SUNPRO_CC) || \
	defined(__IBMCPP__) || defined(__HP_aCC)
	#define GTEST_HAS_TYPED_TEST 1
	#define GTEST_HAS_TYPED_TEST_P 1
#endif

// Determines whether to support Combine(). This only makes sense when
// value-parameterized tests are enabled.  The implementation doesn't
// work on Sun Studio since it doesn't understand templated conversion
// operators.
#if GTEST_HAS_PARAM_TEST && GTEST_HAS_TR1_TUPLE && !defined(__SUNPRO_CC)
	#define GTEST_HAS_COMBINE 1
#endif

// Determines whether the system compiler uses UTF-16 for encoding wide strings.
#define GTEST_WIDE_STRING_USES_UTF16_ \
	(GTEST_OS_WINDOWS || GTEST_OS_CYGWIN || GTEST_OS_SYMBIAN || GTEST_OS_AIX)

// Determines whether test results can be streamed to a socket.
#if GTEST_OS_LINUX
	#define GTEST_CAN_STREAM_RESULTS_ 1
#endif

// Defines some utility macros.

// The GNU compiler emits a warning if nested "if" statements are followed by
// an "else" statement and braces are not used to explicitly disambiguate the
// "else" binding.  This leads to problems with code like:
//
//   if (gate)
//     ASSERT_*(condition) << "Some message";
//
// The "switch (0) case 0:" idiom is used to suppress this.
#ifdef __INTEL_COMPILER
	#define GTEST_AMBIGUOUS_ELSE_BLOCKER_
#else
	#define GTEST_AMBIGUOUS_ELSE_BLOCKER_ switch (0) case 0: default:  // NOLINT
#endif

// Use this annotation at the end of a struct/class definition to
// prevent the compiler from optimizing away instances that are never
// used.  This is useful when all interesting logic happens inside the
// c'tor and / or d'tor.  Example:
//
//   struct Foo {
//     Foo() { ... }
//   } GTEST_ATTRIBUTE_UNUSED_;
//
// Also use it after a variable or parameter declaration to tell the
// compiler the variable/parameter does not have to be used.
#if defined(__GNUC__) && !defined(COMPILER_ICC)
	#define GTEST_ATTRIBUTE_UNUSED_ __attribute__ ((unused))
#else
	#define GTEST_ATTRIBUTE_UNUSED_
#endif

// A macro to disallow operator=
// This should be used in the private: declarations for a class.
#define GTEST_DISALLOW_ASSIGN_(type)\
	void operator=(type const &)

// A macro to disallow copy constructor and operator=
// This should be used in the private: declarations for a class.
#define GTEST_DISALLOW_COPY_AND_ASSIGN_(type)\
	type(type const &);\
	GTEST_DISALLOW_ASSIGN_(type)

// Tell the compiler to warn about unused return values for functions declared
// with this macro.  The macro should be used on function declarations
// following the argument list:
//
//   Sprocket* AllocateSprocket() GTEST_MUST_USE_RESULT_;
#if defined(__GNUC__) && (GTEST_GCC_VER_ >= 30400) && !defined(COMPILER_ICC)
	#define GTEST_MUST_USE_RESULT_ __attribute__ ((warn_unused_result))
#else
	#define GTEST_MUST_USE_RESULT_
#endif  // __GNUC__ && (GTEST_GCC_VER_ >= 30400) && !COMPILER_ICC

// Determine whether the compiler supports Microsoft's Structured Exception
// Handling.  This is supported by several Windows compilers but generally
// does not exist on any other system.
#ifndef GTEST_HAS_SEH
	// The user didn't tell us, so we need to figure it out.

	#if defined(_MSC_VER) || defined(__BORLANDC__)
		// These two compilers are known to support SEH.
		#define GTEST_HAS_SEH 1
	#else
		// Assume no SEH.
		#define GTEST_HAS_SEH 0
	#endif

#endif  // GTEST_HAS_SEH

#ifdef _MSC_VER

	#if GTEST_LINKED_AS_SHARED_LIBRARY
		#define GTEST_API_ __declspec(dllimport)
	#elif GTEST_CREATE_SHARED_LIBRARY
		#define GTEST_API_ __declspec(dllexport)
	#endif

#endif  // _MSC_VER

#ifndef GTEST_API_
	#define GTEST_API_
#endif

#ifdef __GNUC__
	// Ask the compiler to never inline a given function.
	#define GTEST_NO_INLINE_ __attribute__((noinline))
#else
	#define GTEST_NO_INLINE_
#endif

// _LIBCPP_VERSION is defined by the libc++ library from the LLVM project.
#if defined(__GLIBCXX__) || defined(_LIBCPP_VERSION)
	#define GTEST_HAS_CXXABI_H_ 1
#else
	#define GTEST_HAS_CXXABI_H_ 0
#endif

namespace testing
{

	class Message;

	namespace internal
	{

		// A secret type that Google Test users don't know about.  It has no
		// definition on purpose.  Therefore it's impossible to create a
		// Secret object, which is what we want.
		class Secret;

		// The GTEST_COMPILE_ASSERT_ macro can be used to verify that a compile time
		// expression is true. For example, you could use it to verify the
		// size of a static array:
		//
		//   GTEST_COMPILE_ASSERT_(ARRAYSIZE(content_type_names) == CONTENT_NUM_TYPES,
		//                         content_type_names_incorrect_size);
		//
		// or to make sure a struct is smaller than a certain size:
		//
		//   GTEST_COMPILE_ASSERT_(sizeof(foo) < 128, foo_too_large);
		//
		// The second argument to the macro is the name of the variable. If
		// the expression is false, most compilers will issue a warning/error
		// containing the name of the variable.

		template <bool>
		struct CompileAssert
		{
		};

#define GTEST_COMPILE_ASSERT_(expr, msg) \
	typedef ::testing::internal::CompileAssert<(static_cast<bool>(expr))> \
	msg[static_cast<bool>(expr) ? 1 : -1] GTEST_ATTRIBUTE_UNUSED_

		// Implementation details of GTEST_COMPILE_ASSERT_:
		//
		// - GTEST_COMPILE_ASSERT_ works by defining an array type that has -1
		//   elements (and thus is invalid) when the expression is false.
		//
		// - The simpler definition
		//
		//    #define GTEST_COMPILE_ASSERT_(expr, msg) typedef char msg[(expr) ? 1 : -1]
		//
		//   does not work, as gcc supports variable-length arrays whose sizes
		//   are determined at run-time (this is gcc's extension and not part
		//   of the C++ standard).  As a result, gcc fails to reject the
		//   following code with the simple definition:
		//
		//     int foo;
		//     GTEST_COMPILE_ASSERT_(foo, msg); // not supposed to compile as foo is
		//                                      // not a compile-time constant.
		//
		// - By using the type CompileAssert<(bool(expr))>, we ensures that
		//   expr is a compile-time constant.  (Template arguments must be
		//   determined at compile-time.)
		//
		// - The outter parentheses in CompileAssert<(bool(expr))> are necessary
		//   to work around a bug in gcc 3.4.4 and 4.0.1.  If we had written
		//
		//     CompileAssert<bool(expr)>
		//
		//   instead, these compilers will refuse to compile
		//
		//     GTEST_COMPILE_ASSERT_(5 > 0, some_message);
		//
		//   (They seem to think the ">" in "5 > 0" marks the end of the
		//   template argument list.)
		//
		// - The array size is (bool(expr) ? 1 : -1), instead of simply
		//
		//     ((expr) ? 1 : -1).
		//
		//   This is to avoid running into a bug in MS VC 7.1, which
		//   causes ((0.0) ? 1 : -1) to incorrectly evaluate to 1.

		// StaticAssertTypeEqHelper is used by StaticAssertTypeEq defined in gtest.h.
		//
		// This template is declared, but intentionally undefined.
		template <typename T1, typename T2>
		struct StaticAssertTypeEqHelper;

		template <typename T>
		struct StaticAssertTypeEqHelper<T, T> {};

#if GTEST_HAS_GLOBAL_STRING
	typedef ::string string;
#else
	typedef ::std::string string;
#endif  // GTEST_HAS_GLOBAL_STRING

#if GTEST_HAS_GLOBAL_WSTRING
	typedef ::wstring wstring;
#elif GTEST_HAS_STD_WSTRING
	typedef ::std::wstring wstring;
#endif  // GTEST_HAS_GLOBAL_WSTRING

		// A helper for suppressing warnings on constant condition.  It just
		// returns 'condition'.
		GTEST_API_ bool IsTrue(bool condition);

		// Defines scoped_ptr.

		// This implementation of scoped_ptr is PARTIAL - it only contains
		// enough stuff to satisfy Google Test's need.
		template <typename T>
		class scoped_ptr
		{
		public:
			typedef T element_type;

			explicit scoped_ptr(T *p = NULL) : ptr_(p) {}
			~scoped_ptr()
			{
				reset();
			}

			T &operator*() const
			{
				return *ptr_;
			}
			T *operator->() const
			{
				return ptr_;
			}
			T *get() const
			{
				return ptr_;
			}

			T *release()
			{
				T *const ptr = ptr_;
				ptr_ = NULL;
				return ptr;
			}

			void reset(T *p = NULL)
			{
				if (p != ptr_)
				{
					if (IsTrue(sizeof(T) > 0))    // Makes sure T is a complete type.
					{
						delete ptr_;
					}
					ptr_ = p;
				}
			}

		private:
			T *ptr_;

			GTEST_DISALLOW_COPY_AND_ASSIGN_(scoped_ptr);
		};

		// Defines RE.

		// A simple C++ wrapper for <regex.h>.  It uses the POSIX Extended
		// Regular Expression syntax.
		class GTEST_API_ RE
		{
		public:
			// A copy constructor is required by the Standard to initialize object
			// references from r-values.
			RE(const RE &other)
			{
				Init(other.pattern());
			}

			// Constructs an RE from a string.
			RE(const ::std::string &regex)
			{
				Init(regex.c_str());    // NOLINT
			}

#if GTEST_HAS_GLOBAL_STRING

			RE(const ::string &regex)
			{
				Init(regex.c_str());    // NOLINT
			}

#endif  // GTEST_HAS_GLOBAL_STRING

			RE(const char *regex)
			{
				Init(regex);    // NOLINT
			}
			~RE();

			// Returns the string representation of the regex.
			const char *pattern() const
			{
				return pattern_;
			}

			// FullMatch(str, re) returns true iff regular expression re matches
			// the entire str.
			// PartialMatch(str, re) returns true iff regular expression re
			// matches a substring of str (including str itself).
			//
			// TODO(wan@google.com): make FullMatch() and PartialMatch() work
			// when str contains NUL characters.
			static bool FullMatch(const ::std::string &str, const RE &re)
			{
				return FullMatch(str.c_str(), re);
			}
			static bool PartialMatch(const ::std::string &str, const RE &re)
			{
				return PartialMatch(str.c_str(), re);
			}

#if GTEST_HAS_GLOBAL_STRING

			static bool FullMatch(const ::string &str, const RE &re)
			{
				return FullMatch(str.c_str(), re);
			}
			static bool PartialMatch(const ::string &str, const RE &re)
			{
				return PartialMatch(str.c_str(), re);
			}

#endif  // GTEST_HAS_GLOBAL_STRING

			static bool FullMatch(const char *str, const RE &re);
			static bool PartialMatch(const char *str, const RE &re);

		private:
			void Init(const char *regex);

			// We use a const char* instead of an std::string, as Google Test used to be
			// used where std::string is not available.  TODO(wan@google.com): change to
			// std::string.
			const char *pattern_;
			bool is_valid_;

#if GTEST_USES_POSIX_RE

			regex_t full_regex_;     // For FullMatch().
			regex_t partial_regex_;  // For PartialMatch().

#else  // GTEST_USES_SIMPLE_RE

			const char *full_pattern_;  // For FullMatch();

#endif

			GTEST_DISALLOW_ASSIGN_(RE);
		};

		// Formats a source file path and a line number as they would appear
		// in an error message from the compiler used to compile this code.
		GTEST_API_ ::std::string FormatFileLocation(const char *file, int line);

		// Formats a file location for compiler-independent XML output.
		// Although this function is not platform dependent, we put it next to
		// FormatFileLocation in order to contrast the two functions.
		GTEST_API_ ::std::string FormatCompilerIndependentFileLocation(const char *file,
		                                                               int line);

		// Defines logging utilities:
		//   GTEST_LOG_(severity) - logs messages at the specified severity level. The
		//                          message itself is streamed into the macro.
		//   LogToStderr()  - directs all log messages to stderr.
		//   FlushInfoLog() - flushes informational log messages.

		enum GTestLogSeverity
		{
			GTEST_INFO,
			GTEST_WARNING,
			GTEST_ERROR,
			GTEST_FATAL
		};

		// Formats log entry severity, provides a stream object for streaming the
		// log message, and terminates the message with a newline when going out of
		// scope.
		class GTEST_API_ GTestLog
		{
		public:
			GTestLog(GTestLogSeverity severity, const char *file, int line);

			// Flushes the buffers and, if severity is GTEST_FATAL, aborts the program.
			~GTestLog();

			::std::ostream &GetStream()
			{
				return ::std::cerr;
			}

		private:
			const GTestLogSeverity severity_;

			GTEST_DISALLOW_COPY_AND_ASSIGN_(GTestLog);
		};

#define GTEST_LOG_(severity) \
	::testing::internal::GTestLog(::testing::internal::GTEST_##severity, \
	                              __FILE__, __LINE__).GetStream()

		inline void LogToStderr() {}
		inline void FlushInfoLog()
		{
			fflush(NULL);
		}

		// INTERNAL IMPLEMENTATION - DO NOT USE.
		//
		// GTEST_CHECK_ is an all-mode assert. It aborts the program if the condition
		// is not satisfied.
		//  Synopsys:
		//    GTEST_CHECK_(boolean_condition);
		//     or
		//    GTEST_CHECK_(boolean_condition) << "Additional message";
		//
		//    This checks the condition and if the condition is not satisfied
		//    it prints message about the condition violation, including the
		//    condition itself, plus additional message streamed into it, if any,
		//    and then it aborts the program. It aborts the program irrespective of
		//    whether it is built in the debug mode or not.
#define GTEST_CHECK_(condition) \
	GTEST_AMBIGUOUS_ELSE_BLOCKER_ \
	if (::testing::internal::IsTrue(condition)) \
		; \
	else \
		GTEST_LOG_(FATAL) << "Condition " #condition " failed. "

		// An all-mode assert to verify that the given POSIX-style function
		// call returns 0 (indicating success).  Known limitation: this
		// doesn't expand to a balanced 'if' statement, so enclose the macro
		// in {} if you need to use it as the only statement in an 'if'
		// branch.
#define GTEST_CHECK_POSIX_SUCCESS_(posix_call) \
	if (const int gtest_error = (posix_call)) \
		GTEST_LOG_(FATAL) << #posix_call << "failed with error " \
		                  << gtest_error

		// INTERNAL IMPLEMENTATION - DO NOT USE IN USER CODE.
		//
		// Use ImplicitCast_ as a safe version of static_cast for upcasting in
		// the type hierarchy (e.g. casting a Foo* to a SuperclassOfFoo* or a
		// const Foo*).  When you use ImplicitCast_, the compiler checks that
		// the cast is safe.  Such explicit ImplicitCast_s are necessary in
		// surprisingly many situations where C++ demands an exact type match
		// instead of an argument type convertable to a target type.
		//
		// The syntax for using ImplicitCast_ is the same as for static_cast:
		//
		//   ImplicitCast_<ToType>(expr)
		//
		// ImplicitCast_ would have been part of the C++ standard library,
		// but the proposal was submitted too late.  It will probably make
		// its way into the language in the future.
		//
		// This relatively ugly name is intentional. It prevents clashes with
		// similar functions users may have (e.g., implicit_cast). The internal
		// namespace alone is not enough because the function can be found by ADL.
		template<typename To>
		inline To ImplicitCast_(To x)
		{
			return x;
		}

		// When you upcast (that is, cast a pointer from type Foo to type
		// SuperclassOfFoo), it's fine to use ImplicitCast_<>, since upcasts
		// always succeed.  When you downcast (that is, cast a pointer from
		// type Foo to type SubclassOfFoo), static_cast<> isn't safe, because
		// how do you know the pointer is really of type SubclassOfFoo?  It
		// could be a bare Foo, or of type DifferentSubclassOfFoo.  Thus,
		// when you downcast, you should use this macro.  In debug mode, we
		// use dynamic_cast<> to double-check the downcast is legal (we die
		// if it's not).  In normal mode, we do the efficient static_cast<>
		// instead.  Thus, it's important to test in debug mode to make sure
		// the cast is legal!
		//    This is the only place in the code we should use dynamic_cast<>.
		// In particular, you SHOULDN'T be using dynamic_cast<> in order to
		// do RTTI (eg code like this:
		//    if (dynamic_cast<Subclass1>(foo)) HandleASubclass1Object(foo);
		//    if (dynamic_cast<Subclass2>(foo)) HandleASubclass2Object(foo);
		// You should design the code some other way not to need this.
		//
		// This relatively ugly name is intentional. It prevents clashes with
		// similar functions users may have (e.g., down_cast). The internal
		// namespace alone is not enough because the function can be found by ADL.
		template<typename To, typename From>  // use like this: DownCast_<T*>(foo);
		inline To DownCast_(From *f)    // so we only accept pointers
		{
			// Ensures that To is a sub-type of From *.  This test is here only
			// for compile-time type checking, and has no overhead in an
			// optimized build at run-time, as it will be optimized away
			// completely.
			if (false)
			{
				const To to = NULL;
				::testing::internal::ImplicitCast_<From *>(to);
			}

#if GTEST_HAS_RTTI
			// RTTI: debug mode only!
			GTEST_CHECK_(f == NULL || dynamic_cast<To>(f) != NULL);
#endif
			return static_cast<To>(f);
		}

		// Downcasts the pointer of type Base to Derived.
		// Derived must be a subclass of Base. The parameter MUST
		// point to a class of type Derived, not any subclass of it.
		// When RTTI is available, the function performs a runtime
		// check to enforce this.
		template <class Derived, class Base>
		Derived *CheckedDowncastToActualType(Base *base)
		{
#if GTEST_HAS_RTTI
			GTEST_CHECK_(typeid(*base) == typeid(Derived));
			return dynamic_cast<Derived *>(base); // NOLINT
#else
			return static_cast<Derived *>(base); // Poor man's downcast.
#endif
		}

#if GTEST_HAS_STREAM_REDIRECTION

	// Defines the stderr capturer:
	//   CaptureStdout     - starts capturing stdout.
	//   GetCapturedStdout - stops capturing stdout and returns the captured string.
	//   CaptureStderr     - starts capturing stderr.
	//   GetCapturedStderr - stops capturing stderr and returns the captured string.
	//
	GTEST_API_ void CaptureStdout();
	GTEST_API_ std::string GetCapturedStdout();
	GTEST_API_ void CaptureStderr();
	GTEST_API_ std::string GetCapturedStderr();

#endif  // GTEST_HAS_STREAM_REDIRECTION


#if GTEST_HAS_DEATH_TEST

		const ::std::vector<testing::internal::string> &GetInjectableArgvs();
		void SetInjectableArgvs(const ::std::vector<testing::internal::string> *
		                        new_argvs);

		// A copy of all command line arguments.  Set by InitGoogleTest().
		extern ::std::vector<testing::internal::string> g_argvs;

#endif  // GTEST_HAS_DEATH_TEST

		// Defines synchronization primitives.

#if GTEST_HAS_PTHREAD

		// Sleeps for (roughly) n milli-seconds.  This function is only for
		// testing Google Test's own constructs.  Don't use it in user tests,
		// either directly or indirectly.
		inline void SleepMilliseconds(int n)
		{
			const timespec time =
			{
				0,                  // 0 seconds.
				n * 1000L * 1000L,  // And n ms.
			};
			nanosleep(&time, NULL);
		}

		// Allows a controller thread to pause execution of newly created
		// threads until notified.  Instances of this class must be created
		// and destroyed in the controller thread.
		//
		// This class is only for testing Google Test's own constructs. Do not
		// use it in user tests, either directly or indirectly.
		class Notification
		{
		public:
			Notification() : notified_(false)
			{
				GTEST_CHECK_POSIX_SUCCESS_(pthread_mutex_init(&mutex_, NULL));
			}
			~Notification()
			{
				pthread_mutex_destroy(&mutex_);
			}

			// Notifies all threads created with this notification to start. Must
			// be called from the controller thread.
			void Notify()
			{
				pthread_mutex_lock(&mutex_);
				notified_ = true;
				pthread_mutex_unlock(&mutex_);
			}

			// Blocks until the controller thread notifies. Must be called from a test
			// thread.
			void WaitForNotification()
			{
				for (;;)
				{
					pthread_mutex_lock(&mutex_);
					const bool notified = notified_;
					pthread_mutex_unlock(&mutex_);
					if (notified)
						break;
					SleepMilliseconds(10);
				}
			}

		private:
			pthread_mutex_t mutex_;
			bool notified_;

			GTEST_DISALLOW_COPY_AND_ASSIGN_(Notification);
		};

		// As a C-function, ThreadFuncWithCLinkage cannot be templated itself.
		// Consequently, it cannot select a correct instantiation of ThreadWithParam
		// in order to call its Run(). Introducing ThreadWithParamBase as a
		// non-templated base class for ThreadWithParam allows us to bypass this
		// problem.
		class ThreadWithParamBase
		{
		public:
			virtual ~ThreadWithParamBase() {}
			virtual void Run() = 0;
		};

		// pthread_create() accepts a pointer to a function type with the C linkage.
		// According to the Standard (7.5/1), function types with different linkages
		// are different even if they are otherwise identical.  Some compilers (for
		// example, SunStudio) treat them as different types.  Since class methods
		// cannot be defined with C-linkage we need to define a free C-function to
		// pass into pthread_create().
		extern "C" inline void *ThreadFuncWithCLinkage(void *thread)
		{
			static_cast<ThreadWithParamBase *>(thread)->Run();
			return NULL;
		}

		// Helper class for testing Google Test's multi-threading constructs.
		// To use it, write:
		//
		//   void ThreadFunc(int param) { /* Do things with param */ }
		//   Notification thread_can_start;
		//   ...
		//   // The thread_can_start parameter is optional; you can supply NULL.
		//   ThreadWithParam<int> thread(&ThreadFunc, 5, &thread_can_start);
		//   thread_can_start.Notify();
		//
		// These classes are only for testing Google Test's own constructs. Do
		// not use them in user tests, either directly or indirectly.
		template <typename T>
		class ThreadWithParam : public ThreadWithParamBase
		{
		public:
			typedef void (*UserThreadFunc)(T);

			ThreadWithParam(
			    UserThreadFunc func, T param, Notification *thread_can_start)
				: func_(func),
				  param_(param),
				  thread_can_start_(thread_can_start),
				  finished_(false)
			{
				ThreadWithParamBase *const base = this;
				// The thread can be created only after all fields except thread_
				// have been initialized.
				GTEST_CHECK_POSIX_SUCCESS_(
				    pthread_create(&thread_, 0, &ThreadFuncWithCLinkage, base));
			}
			~ThreadWithParam()
			{
				Join();
			}

			void Join()
			{
				if (!finished_)
				{
					GTEST_CHECK_POSIX_SUCCESS_(pthread_join(thread_, 0));
					finished_ = true;
				}
			}

			virtual void Run()
			{
				if (thread_can_start_ != NULL)
					thread_can_start_->WaitForNotification();
				func_(param_);
			}

		private:
			const UserThreadFunc func_;  // User-supplied thread function.
			const T param_;  // User-supplied parameter to the thread function.
			// When non-NULL, used to block execution until the controller thread
			// notifies.
			Notification *const thread_can_start_;
			bool finished_;  // true iff we know that the thread function has finished.
			pthread_t thread_;  // The native thread object.

			GTEST_DISALLOW_COPY_AND_ASSIGN_(ThreadWithParam);
		};

		// MutexBase and Mutex implement mutex on pthreads-based platforms. They
		// are used in conjunction with class MutexLock:
		//
		//   Mutex mutex;
		//   ...
		//   MutexLock lock(&mutex);  // Acquires the mutex and releases it at the end
		//                            // of the current scope.
		//
		// MutexBase implements behavior for both statically and dynamically
		// allocated mutexes.  Do not use MutexBase directly.  Instead, write
		// the following to define a static mutex:
		//
		//   GTEST_DEFINE_STATIC_MUTEX_(g_some_mutex);
		//
		// You can forward declare a static mutex like this:
		//
		//   GTEST_DECLARE_STATIC_MUTEX_(g_some_mutex);
		//
		// To create a dynamic mutex, just define an object of type Mutex.
		class MutexBase
		{
		public:
			// Acquires this mutex.
			void Lock()
			{
				GTEST_CHECK_POSIX_SUCCESS_(pthread_mutex_lock(&mutex_));
				owner_ = pthread_self();
				has_owner_ = true;
			}

			// Releases this mutex.
			void Unlock()
			{
				// Since the lock is being released the owner_ field should no longer be
				// considered valid. We don't protect writing to has_owner_ here, as it's
				// the caller's responsibility to ensure that the current thread holds the
				// mutex when this is called.
				has_owner_ = false;
				GTEST_CHECK_POSIX_SUCCESS_(pthread_mutex_unlock(&mutex_));
			}

			// Does nothing if the current thread holds the mutex. Otherwise, crashes
			// with high probability.
			void AssertHeld() const
			{
				GTEST_CHECK_(has_owner_ && pthread_equal(owner_, pthread_self()))
				        << "The current thread is not holding the mutex @" << this;
			}

			// A static mutex may be used before main() is entered.  It may even
			// be used before the dynamic initialization stage.  Therefore we
			// must be able to initialize a static mutex object at link time.
			// This means MutexBase has to be a POD and its member variables
			// have to be public.
		public:
			pthread_mutex_t mutex_;  // The underlying pthread mutex.
			// has_owner_ indicates whether the owner_ field below contains a valid thread
			// ID and is therefore safe to inspect (e.g., to use in pthread_equal()). All
			// accesses to the owner_ field should be protected by a check of this field.
			// An alternative might be to memset() owner_ to all zeros, but there's no
			// guarantee that a zero'd pthread_t is necessarily invalid or even different
			// from pthread_self().
			bool has_owner_;
			pthread_t owner_;  // The thread holding the mutex.
		};

		// Forward-declares a static mutex.
# define GTEST_DECLARE_STATIC_MUTEX_(mutex) \
	extern ::testing::internal::MutexBase mutex

		// Defines and statically (i.e. at link time) initializes a static mutex.
		// The initialization list here does not explicitly initialize each field,
		// instead relying on default initialization for the unspecified fields. In
		// particular, the owner_ field (a pthread_t) is not explicitly initialized.
		// This allows initialization to work whether pthread_t is a scalar or struct.
		// The flag -Wmissing-field-initializers must not be specified for this to work.
# define GTEST_DEFINE_STATIC_MUTEX_(mutex) \
	::testing::internal::MutexBase mutex = { PTHREAD_MUTEX_INITIALIZER, false }

		// The Mutex class can only be used for mutexes created at runtime. It
		// shares its API with MutexBase otherwise.
		class Mutex : public MutexBase
		{
		public:
			Mutex()
			{
				GTEST_CHECK_POSIX_SUCCESS_(pthread_mutex_init(&mutex_, NULL));
				has_owner_ = false;
			}
			~Mutex()
			{
				GTEST_CHECK_POSIX_SUCCESS_(pthread_mutex_destroy(&mutex_));
			}

		private:
			GTEST_DISALLOW_COPY_AND_ASSIGN_(Mutex);
		};

		// We cannot name this class MutexLock as the ctor declaration would
		// conflict with a macro named MutexLock, which is defined on some
		// platforms.  Hence the typedef trick below.
		class GTestMutexLock
		{
		public:
			explicit GTestMutexLock(MutexBase *mutex)
				: mutex_(mutex)
			{
				mutex_->Lock();
			}

			~GTestMutexLock()
			{
				mutex_->Unlock();
			}

		private:
			MutexBase *const mutex_;

			GTEST_DISALLOW_COPY_AND_ASSIGN_(GTestMutexLock);
		};

		typedef GTestMutexLock MutexLock;

		// Helpers for ThreadLocal.

		// pthread_key_create() requires DeleteThreadLocalValue() to have
		// C-linkage.  Therefore it cannot be templatized to access
		// ThreadLocal<T>.  Hence the need for class
		// ThreadLocalValueHolderBase.
		class ThreadLocalValueHolderBase
		{
		public:
			virtual ~ThreadLocalValueHolderBase() {}
		};

		// Called by pthread to delete thread-local data stored by
		// pthread_setspecific().
		extern "C" inline void DeleteThreadLocalValue(void *value_holder)
		{
			delete static_cast<ThreadLocalValueHolderBase *>(value_holder);
		}

		// Implements thread-local storage on pthreads-based systems.
		//
		//   // Thread 1
		//   ThreadLocal<int> tl(100);  // 100 is the default value for each thread.
		//
		//   // Thread 2
		//   tl.set(150);  // Changes the value for thread 2 only.
		//   EXPECT_EQ(150, tl.get());
		//
		//   // Thread 1
		//   EXPECT_EQ(100, tl.get());  // In thread 1, tl has the original value.
		//   tl.set(200);
		//   EXPECT_EQ(200, tl.get());
		//
		// The template type argument T must have a public copy constructor.
		// In addition, the default ThreadLocal constructor requires T to have
		// a public default constructor.
		//
		// An object managed for a thread by a ThreadLocal instance is deleted
		// when the thread exits.  Or, if the ThreadLocal instance dies in
		// that thread, when the ThreadLocal dies.  It's the user's
		// responsibility to ensure that all other threads using a ThreadLocal
		// have exited when it dies, or the per-thread objects for those
		// threads will not be deleted.
		//
		// Google Test only uses global ThreadLocal objects.  That means they
		// will die after main() has returned.  Therefore, no per-thread
		// object managed by Google Test will be leaked as long as all threads
		// using Google Test have exited when main() returns.
		template <typename T>
		class ThreadLocal
		{
		public:
			ThreadLocal() : key_(CreateKey()),
				default_() {}
			explicit ThreadLocal(const T &value) : key_(CreateKey()),
				default_(value) {}

			~ThreadLocal()
			{
				// Destroys the managed object for the current thread, if any.
				DeleteThreadLocalValue(pthread_getspecific(key_));

				// Releases resources associated with the key.  This will *not*
				// delete managed objects for other threads.
				GTEST_CHECK_POSIX_SUCCESS_(pthread_key_delete(key_));
			}

			T *pointer()
			{
				return GetOrCreateValue();
			}
			const T *pointer() const
			{
				return GetOrCreateValue();
			}
			const T &get() const
			{
				return *pointer();
			}
			void set(const T &value)
			{
				*pointer() = value;
			}

		private:
			// Holds a value of type T.
			class ValueHolder : public ThreadLocalValueHolderBase
			{
			public:
				explicit ValueHolder(const T &value) : value_(value) {}

				T *pointer()
				{
					return &value_;
				}

			private:
				T value_;
				GTEST_DISALLOW_COPY_AND_ASSIGN_(ValueHolder);
			};

			static pthread_key_t CreateKey()
			{
				pthread_key_t key;
				// When a thread exits, DeleteThreadLocalValue() will be called on
				// the object managed for that thread.
				GTEST_CHECK_POSIX_SUCCESS_(
				    pthread_key_create(&key, &DeleteThreadLocalValue));
				return key;
			}

			T *GetOrCreateValue() const
			{
				ThreadLocalValueHolderBase *const holder =
				    static_cast<ThreadLocalValueHolderBase *>(pthread_getspecific(key_));
				if (holder != NULL)
				{
					return CheckedDowncastToActualType<ValueHolder>(holder)->pointer();
				}

				ValueHolder *const new_holder = new ValueHolder(default_);
				ThreadLocalValueHolderBase *const holder_base = new_holder;
				GTEST_CHECK_POSIX_SUCCESS_(pthread_setspecific(key_, holder_base));
				return new_holder->pointer();
			}

			// A key pthreads uses for looking up per-thread values.
			const pthread_key_t key_;
			const T default_;  // The default value for each thread.

			GTEST_DISALLOW_COPY_AND_ASSIGN_(ThreadLocal);
		};

# define GTEST_IS_THREADSAFE 1

#else  // GTEST_HAS_PTHREAD

		// A dummy implementation of synchronization primitives (mutex, lock,
		// and thread-local variable).  Necessary for compiling Google Test where
		// mutex is not supported - using Google Test in multiple threads is not
		// supported on such platforms.

		class Mutex
		{
		public:
			Mutex() {}
			void Lock() {}
			void Unlock() {}
			void AssertHeld() const {}
		};

# define GTEST_DECLARE_STATIC_MUTEX_(mutex) \
	extern ::testing::internal::Mutex mutex

# define GTEST_DEFINE_STATIC_MUTEX_(mutex) ::testing::internal::Mutex mutex

		class GTestMutexLock
		{
		public:
			explicit GTestMutexLock(Mutex *) {} // NOLINT
		};

		typedef GTestMutexLock MutexLock;

		template <typename T>
		class ThreadLocal
		{
		public:
			ThreadLocal() : value_() {}
			explicit ThreadLocal(const T &value) : value_(value) {}
			T *pointer()
			{
				return &value_;
			}
			const T *pointer() const
			{
				return &value_;
			}
			const T &get() const
			{
				return value_;
			}
			void set(const T &value)
			{
				value_ = value;
			}
		private:
			T value_;
		};

		// The above synchronization primitives have dummy implementations.
		// Therefore Google Test is not thread-safe.
# define GTEST_IS_THREADSAFE 0

#endif  // GTEST_HAS_PTHREAD

		// Returns the number of threads running in the process, or 0 to indicate that
		// we cannot detect it.
		GTEST_API_ size_t GetThreadCount();

		// Passing non-POD classes through ellipsis (...) crashes the ARM
		// compiler and generates a warning in Sun Studio.  The Nokia Symbian
		// and the IBM XL C/C++ compiler try to instantiate a copy constructor
		// for objects passed through ellipsis (...), failing for uncopyable
		// objects.  We define this to ensure that only POD is passed through
		// ellipsis on these systems.
#if defined(__SYMBIAN32__) || defined(__IBMCPP__) || defined(__SUNPRO_CC)
	// We lose support for NULL detection where the compiler doesn't like
	// passing non-POD classes through ellipsis (...).
	#define GTEST_ELLIPSIS_NEEDS_POD_ 1
#else
	#define GTEST_CAN_COMPARE_NULL 1
#endif

		// The Nokia Symbian and IBM XL C/C++ compilers cannot decide between
		// const T& and const T* in a function template.  These compilers
		// _can_ decide between class template specializations for T and T*,
		// so a tr1::type_traits-like is_pointer works.
#if defined(__SYMBIAN32__) || defined(__IBMCPP__)
	#define GTEST_NEEDS_IS_POINTER_ 1
#endif

		template <bool bool_value>
		struct bool_constant
		{
			typedef bool_constant<bool_value> type;
			static const bool value = bool_value;
		};
		template <bool bool_value> const bool bool_constant<bool_value>::value;

		typedef bool_constant<false> false_type;
		typedef bool_constant<true> true_type;

		template <typename T>
		struct is_pointer : public false_type {};

		template <typename T>
		struct is_pointer<T *> : public true_type {};

		template <typename Iterator>
		struct IteratorTraits
		{
			typedef typename Iterator::value_type value_type;
		};

		template <typename T>
		struct IteratorTraits<T *>
		{
			typedef T value_type;
		};

		template <typename T>
		struct IteratorTraits<const T *>
		{
			typedef T value_type;
		};

#if GTEST_OS_WINDOWS
	#define GTEST_PATH_SEP_ "\\"
	#define GTEST_HAS_ALT_PATH_SEP_ 1
	// The biggest signed integer type the compiler supports.
	typedef __int64 BiggestInt;
#else
	#define GTEST_PATH_SEP_ "/"
	#define GTEST_HAS_ALT_PATH_SEP_ 0
	typedef long long BiggestInt;  // NOLINT
#endif  // GTEST_OS_WINDOWS

		// Utilities for char.

		// isspace(int ch) and friends accept an unsigned char or EOF.  char
		// may be signed, depending on the compiler (or compiler flags).
		// Therefore we need to cast a char to unsigned char before calling
		// isspace(), etc.

		inline bool IsAlpha(char ch)
		{
			return isalpha(static_cast<unsigned char>(ch)) != 0;
		}
		inline bool IsAlNum(char ch)
		{
			return isalnum(static_cast<unsigned char>(ch)) != 0;
		}
		inline bool IsDigit(char ch)
		{
			return isdigit(static_cast<unsigned char>(ch)) != 0;
		}
		inline bool IsLower(char ch)
		{
			return islower(static_cast<unsigned char>(ch)) != 0;
		}
		inline bool IsSpace(char ch)
		{
			return isspace(static_cast<unsigned char>(ch)) != 0;
		}
		inline bool IsUpper(char ch)
		{
			return isupper(static_cast<unsigned char>(ch)) != 0;
		}
		inline bool IsXDigit(char ch)
		{
			return isxdigit(static_cast<unsigned char>(ch)) != 0;
		}
		inline bool IsXDigit(wchar_t ch)
		{
			const unsigned char low_byte = static_cast<unsigned char>(ch);
			return ch == low_byte && isxdigit(low_byte) != 0;
		}

		inline char ToLower(char ch)
		{
			return static_cast<char>(tolower(static_cast<unsigned char>(ch)));
		}
		inline char ToUpper(char ch)
		{
			return static_cast<char>(toupper(static_cast<unsigned char>(ch)));
		}

		// The testing::internal::posix namespace holds wrappers for common
		// POSIX functions.  These wrappers hide the differences between
		// Windows/MSVC and POSIX systems.  Since some compilers define these
		// standard functions as macros, the wrapper cannot have the same name
		// as the wrapped function.

		namespace posix
		{

			// Functions with a different name on Windows.

#if GTEST_OS_WINDOWS

			typedef struct _stat StatStruct;

# ifdef __BORLANDC__
			inline int IsATTY(int fd)
			{
				return isatty(fd);
			}
			inline int StrCaseCmp(const char *s1, const char *s2)
			{
				return stricmp(s1, s2);
			}
			inline char *StrDup(const char *src)
			{
				return strdup(src);
			}
# else  // !__BORLANDC__
#  if GTEST_OS_WINDOWS_MOBILE
			inline int IsATTY(int /* fd */)
			{
				return 0;
			}
#  else
			inline int IsATTY(int fd)
			{
				return _isatty(fd);
			}
#  endif  // GTEST_OS_WINDOWS_MOBILE
			inline int StrCaseCmp(const char *s1, const char *s2)
			{
				return _stricmp(s1, s2);
			}
			inline char *StrDup(const char *src)
			{
				return _strdup(src);
			}
# endif  // __BORLANDC__

# if GTEST_OS_WINDOWS_MOBILE
			inline int FileNo(FILE *file)
			{
				return reinterpret_cast<int>(_fileno(file));
			}
			// Stat(), RmDir(), and IsDir() are not needed on Windows CE at this
			// time and thus not defined there.
# else
			inline int FileNo(FILE *file)
			{
				return _fileno(file);
			}
			inline int Stat(const char *path, StatStruct *buf)
			{
				return _stat(path, buf);
			}
			inline int RmDir(const char *dir)
			{
				return _rmdir(dir);
			}
			inline bool IsDir(const StatStruct &st)
			{
				return (_S_IFDIR & st.st_mode) != 0;
			}
# endif  // GTEST_OS_WINDOWS_MOBILE

#else

			typedef struct stat StatStruct;

			inline int FileNo(FILE *file)
			{
				return fileno(file);
			}
			inline int IsATTY(int fd)
			{
				return isatty(fd);
			}
			inline int Stat(const char *path, StatStruct *buf)
			{
				return stat(path, buf);
			}
			inline int StrCaseCmp(const char *s1, const char *s2)
			{
				return strcasecmp(s1, s2);
			}
			inline char *StrDup(const char *src)
			{
				return strdup(src);
			}
			inline int RmDir(const char *dir)
			{
				return rmdir(dir);
			}
			inline bool IsDir(const StatStruct &st)
			{
				return S_ISDIR(st.st_mode);
			}

#endif  // GTEST_OS_WINDOWS

			// Functions deprecated by MSVC 8.0.

#ifdef _MSC_VER
	// Temporarily disable warning 4996 (deprecated function).
	#pragma warning(push)
	#pragma warning(disable:4996)
#endif

			inline const char *StrNCpy(char *dest, const char *src, size_t n)
			{
				return strncpy(dest, src, n);
			}

			// ChDir(), FReopen(), FDOpen(), Read(), Write(), Close(), and
			// StrError() aren't needed on Windows CE at this time and thus not
			// defined there.

#if !GTEST_OS_WINDOWS_MOBILE
			inline int ChDir(const char *dir)
			{
				return chdir(dir);
			}
#endif
			inline FILE *FOpen(const char *path, const char *mode)
			{
				return fopen(path, mode);
			}
#if !GTEST_OS_WINDOWS_MOBILE
			inline FILE *FReopen(const char *path, const char *mode, FILE *stream)
			{
				return freopen(path, mode, stream);
			}
			inline FILE *FDOpen(int fd, const char *mode)
			{
				return fdopen(fd, mode);
			}
#endif
			inline int FClose(FILE *fp)
			{
				return fclose(fp);
			}
#if !GTEST_OS_WINDOWS_MOBILE
			inline int Read(int fd, void *buf, unsigned int count)
			{
				return static_cast<int>(read(fd, buf, count));
			}
			inline int Write(int fd, const void *buf, unsigned int count)
			{
				return static_cast<int>(write(fd, buf, count));
			}
			inline int Close(int fd)
			{
				return close(fd);
			}
			inline const char *StrError(int errnum)
			{
				return strerror(errnum);
			}
#endif
			inline const char *GetEnv(const char *name)
			{
#if GTEST_OS_WINDOWS_MOBILE
				// We are on Windows CE, which has no environment variables.
				return NULL;
#elif defined(__BORLANDC__) || defined(__SunOS_5_8) || defined(__SunOS_5_9)
				// Environment variables which we programmatically clear will be set to the
				// empty string rather than unset (NULL).  Handle that case.
				const char *const env = getenv(name);
				return (env != NULL && env[0] != '\0') ? env : NULL;
#else
				return getenv(name);
#endif
			}

#ifdef _MSC_VER
	#pragma warning(pop)  // Restores the warning state.
#endif

#if GTEST_OS_WINDOWS_MOBILE
			// Windows CE has no C library. The abort() function is used in
			// several places in Google Test. This implementation provides a reasonable
			// imitation of standard behaviour.
			void Abort();
#else
			inline void Abort()
			{
				abort();
			}
#endif  // GTEST_OS_WINDOWS_MOBILE

		}  // namespace posix

		// MSVC "deprecates" snprintf and issues warnings wherever it is used.  In
		// order to avoid these warnings, we need to use _snprintf or _snprintf_s on
		// MSVC-based platforms.  We map the GTEST_SNPRINTF_ macro to the appropriate
		// function in order to achieve that.  We use macro definition here because
		// snprintf is a variadic function.
#if _MSC_VER >= 1400 && !GTEST_OS_WINDOWS_MOBILE
		// MSVC 2005 and above support variadic macros.
# define GTEST_SNPRINTF_(buffer, size, format, ...) \
	_snprintf_s(buffer, size, size, format, __VA_ARGS__)
#elif defined(_MSC_VER)
		// Windows CE does not define _snprintf_s and MSVC prior to 2005 doesn't
		// complain about _snprintf.
# define GTEST_SNPRINTF_ _snprintf
#else
# define GTEST_SNPRINTF_ snprintf
#endif

		// The maximum number a BiggestInt can represent.  This definition
		// works no matter BiggestInt is represented in one's complement or
		// two's complement.
		//
		// We cannot rely on numeric_limits in STL, as __int64 and long long
		// are not part of standard C++ and numeric_limits doesn't need to be
		// defined for them.
		const BiggestInt kMaxBiggestInt =
		    ~(static_cast<BiggestInt>(1) << (8 * sizeof(BiggestInt) - 1));

		// This template class serves as a compile-time function from size to
		// type.  It maps a size in bytes to a primitive type with that
		// size. e.g.
		//
		//   TypeWithSize<4>::UInt
		//
		// is typedef-ed to be unsigned int (unsigned integer made up of 4
		// bytes).
		//
		// Such functionality should belong to STL, but I cannot find it
		// there.
		//
		// Google Test uses this class in the implementation of floating-point
		// comparison.
		//
		// For now it only handles UInt (unsigned int) as that's all Google Test
		// needs.  Other types can be easily added in the future if need
		// arises.
		template <size_t size>
		class TypeWithSize
		{
		public:
			// This prevents the user from using TypeWithSize<N> with incorrect
			// values of N.
			typedef void UInt;
		};

		// The specialization for size 4.
		template <>
		class TypeWithSize<4>
		{
		public:
			// unsigned int has size 4 in both gcc and MSVC.
			//
			// As base/basictypes.h doesn't compile on Windows, we cannot use
			// uint32, uint64, and etc here.
			typedef int Int;
			typedef unsigned int UInt;
		};

		// The specialization for size 8.
		template <>
		class TypeWithSize<8>
		{
		public:
#if GTEST_OS_WINDOWS
			typedef __int64 Int;
			typedef unsigned __int64 UInt;
#else
			typedef long long Int;  // NOLINT
			typedef unsigned long long UInt;  // NOLINT
#endif  // GTEST_OS_WINDOWS
		};

		// Integer types of known sizes.
		typedef TypeWithSize<4>::Int Int32;
		typedef TypeWithSize<4>::UInt UInt32;
		typedef TypeWithSize<8>::Int Int64;
		typedef TypeWithSize<8>::UInt UInt64;
		typedef TypeWithSize<8>::Int TimeInMillis;  // Represents time in milliseconds.

		// Utilities for command line flags and environment variables.

		// Macro for referencing flags.
#define GTEST_FLAG(name) FLAGS_gtest_##name

		// Macros for declaring flags.
#define GTEST_DECLARE_bool_(name) GTEST_API_ extern bool GTEST_FLAG(name)
#define GTEST_DECLARE_int32_(name) \
	GTEST_API_ extern ::testing::internal::Int32 GTEST_FLAG(name)
#define GTEST_DECLARE_string_(name) \
	GTEST_API_ extern ::std::string GTEST_FLAG(name)

		// Macros for defining flags.
#define GTEST_DEFINE_bool_(name, default_val, doc) \
	GTEST_API_ bool GTEST_FLAG(name) = (default_val)
#define GTEST_DEFINE_int32_(name, default_val, doc) \
	GTEST_API_ ::testing::internal::Int32 GTEST_FLAG(name) = (default_val)
#define GTEST_DEFINE_string_(name, default_val, doc) \
	GTEST_API_ ::std::string GTEST_FLAG(name) = (default_val)

		// Thread annotations
#define GTEST_EXCLUSIVE_LOCK_REQUIRED_(locks)
#define GTEST_LOCK_EXCLUDED_(locks)

		// Parses 'str' for a 32-bit signed integer.  If successful, writes the result
		// to *value and returns true; otherwise leaves *value unchanged and returns
		// false.
		// TODO(chandlerc): Find a better way to refactor flag and environment parsing
		// out of both gtest-port.cc and gtest.cc to avoid exporting this utility
		// function.
		bool ParseInt32(const Message &src_text, const char *str, Int32 *value);

		// Parses a bool/Int32/string from the environment variable
		// corresponding to the given Google Test flag.
		bool BoolFromGTestEnv(const char *flag, bool default_val);
		GTEST_API_ Int32 Int32FromGTestEnv(const char *flag, Int32 default_val);
		const char *StringFromGTestEnv(const char *flag, const char *default_val);

	}  // namespace internal
}  // namespace testing

#endif  // GTEST_INCLUDE_GTEST_INTERNAL_GTEST_PORT_H_
